<products>
<?php
foreach ($this->items as $item)
{
    ?>
<product>
<product_id><?= $item['product_id'] ?></product_id>
<product_name><?= $item['product_name'] ?></product_name>
<supplier><?= $item['supplier'] ?></supplier>
<product_price><?= $item['product_price'] ?></product_price>
</product>
<?php
}
?>
</products>
